package com.lagou.config;

import com.lagou.pojo.Configuration;
import com.lagou.pojo.MappedStatement;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import java.io.InputStream;
import java.util.List;

public class XMLMapperBuilder {

	private Configuration configuration;

	public XMLMapperBuilder(Configuration configuration) {
		this.configuration = configuration;
	}

	public void parse(InputStream inputStream) throws DocumentException {

		Document document = new SAXReader().read(inputStream);
		Element rootElement = document.getRootElement();

		String namespace = rootElement.attributeValue("namespace");

		// 解析查询标签
		addQueryMappedStatementMap(rootElement.selectNodes("//select"), namespace);
		// 解析插入标签
		addUpdateMappedStatementMap(rootElement.selectNodes("//insert"), namespace);
		// 解析更新标签
		addUpdateMappedStatementMap(rootElement.selectNodes("//update"), namespace);
		// 解析删除标签
		addUpdateMappedStatementMap(rootElement.selectNodes("//delete"), namespace);

	}

	private void addQueryMappedStatementMap(List<Element> list, String namespace) {
		for (Element element : list) {
			String id = element.attributeValue("id");
			String resultType = element.attributeValue("resultType");
			String paramterType = element.attributeValue("paramterType");
			String sqlText = element.getTextTrim();
			MappedStatement mappedStatement = new MappedStatement();
			mappedStatement.setId(id);
			mappedStatement.setResultType(resultType);
			mappedStatement.setParamterType(paramterType);
			mappedStatement.setSql(sqlText);
			String key = namespace + "." + id;
			configuration.getMappedStatementMap().put(key, mappedStatement);
		}
	}

	private void addUpdateMappedStatementMap(List<Element> list, String namespace) {
		for (Element element : list) {
			String id = element.attributeValue("id");
			String paramterType = element.attributeValue("paramterType");
			String sqlText = element.getTextTrim();
			MappedStatement mappedStatement = new MappedStatement();
			mappedStatement.setId(id);
			mappedStatement.setParamterType(paramterType);
			mappedStatement.setSql(sqlText);
			String key = namespace + "." + id;
			configuration.getMappedStatementMap().put(key, mappedStatement);
		}
	}

}
